CVE-2026-66038
Fixed in a distro release EPSS <1%CVSS 6.5
FFmpeg through 8.1.2, fixed in commit 8670835, contains an information disclosure vulnerability in the LCL/ZLIB video decoder that allows attackers to expose uninitialized heap memory by supplying a valid zlib stream that inflates to fewer bytes than the expected frame size. The zlib_decomp() function in lcldec.c treats short decompression as non-fatal and continues to the RGB24 conversion path, which copies a full frame's worth of rows from the allocation buffer using original frame dimensions, causing uninitialized heap contents including pointer-derived allocator bytes to be copied into the attacker-observable AVFrame output and potentially defeating ASLR in long-lived media processing services.
Products: FFMPEG
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | eco-python-ffmpeg-6-minimal | no fix |
| Chainguard | eco-python-ffmpeg-6-minimal-dev | no fix |
| Chainguard | eco-python-ffmpeg-6-minimal-static | no fix |
| Chainguard | eco-python-ffmpeg-7-minimal | no fix |
| Chainguard | eco-python-ffmpeg-7-minimal-dev | no fix |
| Chainguard | eco-python-ffmpeg-7-minimal-static | no fix |
| Chainguard | eco-python-ffmpeg-8-minimal | 8.1.3-r0 |
| Chainguard | eco-python-ffmpeg-8-minimal-dev | 8.1.3-r0 |
| Chainguard | eco-python-ffmpeg-8-minimal-static | 8.1.3-r0 |
| Chainguard | ffmpeg-6 | no fix |
| Chainguard | ffmpeg-7 | no fix |
| Chainguard | ffmpeg-7.1 | no fix |
| Chainguard | ffmpeg-8.0 | no fix |
| Chainguard | ffmpeg-8.1 | 8.1.3-r0 |
| Chainguard | ffmpeg-fips-7.1 | no fix |
| Chainguard | ffmpeg-fips-7.1-dev | no fix |
| Chainguard | ffmpeg-fips-7.1-libavcodec61 | no fix |
| Chainguard | ffmpeg-fips-7.1-libavdevice61 | no fix |
| Chainguard | ffmpeg-fips-7.1-libavfilter10 | no fix |
| Chainguard | ffmpeg-fips-7.1-libavformat61 | no fix |
| Chainguard | ffmpeg-fips-7.1-libavutil59 | no fix |
| Chainguard | ffmpeg-fips-7.1-libpostproc58 | no fix |
| Chainguard | ffmpeg-fips-7.1-libswresample5 | no fix |
| Chainguard | ffmpeg-fips-7.1-libswscale8 | no fix |
| Chainguard | ffmpeg-fips-7.1-static | no fix |
| Chainguard | ffmpeg-fips-8.0 | no fix |
| Chainguard | ffmpeg-fips-8.0-dev | no fix |
| Chainguard | ffmpeg-fips-8.0-libavcodec62 | no fix |
| Chainguard | ffmpeg-fips-8.0-libavdevice62 | no fix |
| Chainguard | ffmpeg-fips-8.0-libavfilter11 | no fix |
| Chainguard | ffmpeg-fips-8.0-libavformat62 | no fix |
| Chainguard | ffmpeg-fips-8.0-libavutil60 | no fix |
| Chainguard | ffmpeg-fips-8.0-libswresample6 | no fix |
| Chainguard | ffmpeg-fips-8.0-libswscale9 | no fix |
| Chainguard | ffmpeg-fips-8.0-static | no fix |
| Chainguard | torchaudio-ffmpeg-tarballs | no fix |
| Chainguard | torchaudio-ffmpeg-tarballs-4.4.4 | no fix |
| Chainguard | torchaudio-ffmpeg-tarballs-5.0.3 | no fix |
| Chainguard | torchaudio-ffmpeg-tarballs-6.0 | no fix |
| Debian 12 | ffmpeg | no fix |
| Debian 13 | ffmpeg | no fix |
| Debian 14 | ffmpeg | 7:9.0.2-1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | ffmpeg-4 | 4.4.8-150400.3.72.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | ffmpeg-4 | 4.4.8-150400.3.72.1 |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | ffmpeg-4 | 4.4.8-150600.13.52.1 |
| SUSE Linux Enterprise Server 15 SP4-LTSS | ffmpeg-4 | 4.4.8-150400.3.72.1 |
| SUSE Linux Enterprise Server 16.0 | ffmpeg-7 | 7.1.4-160000.3.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | ffmpeg-4 | 4.4.8-150400.3.72.1 |
| SUSE Linux Enterprise Server for SAP applications 16.0 | ffmpeg-7 | 7.1.4-160000.3.1 |
| SUSE Linux Enterprise Workstation Extension 15 SP7 | ffmpeg-4 | 4.4.8-150600.13.52.1 |
| Ubuntu 26.10 | ffmpeg | no fix |
| Ubuntu Pro 14.04 LTS | libav | no fix |
| Ubuntu Pro 16.04 LTS | ffmpeg | 7:2.8.17-0ubuntu0.1+esm15 |
| Ubuntu Pro 18.04 LTS | ffmpeg | 7:3.4.11-0ubuntu0.1+esm13 |
| Ubuntu Pro 20.04 LTS | ffmpeg | 7:4.2.7-0ubuntu0.1+esm14 |
| Ubuntu Pro 22.04 LTS | ffmpeg | 7:4.4.2-0ubuntu0.22.04.1+esm13 |
| Ubuntu Pro 24.04 LTS | ffmpeg | 7:6.1.1-3ubuntu5+esm11 |
| Ubuntu Pro 26.04 LTS | ffmpeg | 7:8.0.1-3ubuntu2+esm3 |
| Wolfi | ffmpeg-7 | no fix |
| Wolfi | ffmpeg-7.1 | no fix |
| Wolfi | ffmpeg-8.0 | no fix |
| Wolfi | ffmpeg-8.1 | 8.1.3-r0 |
| openSUSE Leap 16.0 | ffmpeg-4 | 4.4.7-bp160.3.1 |
| openSUSE Leap 16.0 | ffmpeg-7 | 7.1.4-160000.3.1 |
| openSUSE Tumbleweed | ffmpeg-4 | 4.4.8-3.1 |
| openSUSE Tumbleweed | ffmpeg-7 | 7.1.5-2.1 |